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PROCEDURE
LETTER
N
KEY AND JOG UNIT TEST
If the display fails to clear when the STOP pad is depressed, first verify the flat ribbon cable is marking
good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts
are closed when the door is closed and open when the door is open. If the door sensing switch (stop
switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make
sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire
between the pins that correspond to the STOP pad marking momentary contact. If the control unit
responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does
not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
CARRY OUT 4R CHECKS.
O
RELAY TEST
CARRY OUT 3D CHECKS.
Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 4 pin connector (E) on the
control unit with an A.C. voltmeter.
The meter should indicate 230 volts, if not check oven circuit.
Relay Test
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, grill
operation, convection operation or dual operation.
DC. voltage indicated .......... Defective relay.
DC. voltage not indicated .... Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL
RY1
RY2
RY3
RY4
RY5
RY6
RY7
RY8
CARRY OUT 4R CHECKS.
P
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
TEST PROCEDURES
COMPONENT TEST
G 8
G 7
G 6
SENSOR COOK
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 18.0V D.C.
Approx. 18.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
19
G 5
G 4
G 3
CONNECTED COMPONENTS
Oven lamp / Turntable motor
High voltage transformer
Grill (Top) heating element
Convection heating element
Touch control transformer
Fan motor
Convection motor
Damper motor
G 2
G 1
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